Pop-up window style.

I am developing an application which can pop up another window when a button on the main window is clicked. I used the CFrameWnd member function LoadFrame(nResID, WS_OVERLAPPEDWINDOW, NULL, &context). The problem is that the popped up window is always on top, even if it is inactive. I tried other window styles, but they are either still always on top or do not show up at all. Is there any way to solve the problem? By the way, how to set the size of the popped up window. I do not want to use the default size. I want it smaller when it is popped up.

The first question: You don't use the LoadFrame fuction.
second question:
You can use CWnd::PreCreateWindow function,It is called by the framework before the creation of the Windows window attached to this CWnd object.

In LoadFrame fuction the context is an instance of CCreateContext. It associates the View with the Frame and the Document. If I do not use the LoadFrame function, how can I associate the View with the Frame and the Document?
How to use CWnd::PreCreateWindow function?

Look up PreCreateWindow and CREATESTRUCT in your documentation, but here's a simple sample that illustrates everything you want and more:

The following window will not have the WS_EX_TOOLWINDOW style when created, will be k_nMyWidth by k_nMyHeight in size, will have the title "Falco Lives!", and will be a top-level window (e.g., outside of your MDI frame). You can also add or remove any other style or extended style, explicitly place the window, change the window's menu, and do a few other things here.

1. cs.hwndParent = NULL; statement causes assertion failure.
2. cs.lpszName = "Falco Lives!"; statement does not work. (The frame is a CChildFrame, not a top-level window)
3. cs.cx = cs.cx/2; statement does dot work.
I guess I did not make the question clear. This is a MDI application. I want to set the child window's style.

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